Now that you mention it. I am a huge fan of the Moto GP. I watch all the races 125, 250 and Moto GP.

I'd like to see betting on which manufacturer or perhaps which team will win. I know it's pretty limited to the major teams, Honda, Yamaha and maybe Ducati, but the other teams Suzuki, Kawasaki, Aprilia are on the improve, and the Proton KR, Harris WCM an Moriwaki are there as well.
Most of the manufacturers have a number of different team entries which make predicting the winner a little harder in the team stakes. The 125 and 250's also have the KTM and the 125's additionally have the Gilera, Derbi and Malaguti's. However you could probably limit this to the Moto GP class.

Betting on the 125 and 250cc races, not limited to when they race in Aus. On all races.

Betting on the Superbike and Supersports series too.

CRICKET:

Correct number of wickets by the top bowlers in an innings.